关键词: 桥梁工程, FRP, 防撞装置, 连接结构, 结构试验, 数值模拟

Abstract: Aiming at the problem that composite material anti-collision device was easy to cause failure of connection and loss of protective performance, a new connection structure was proposed. Firstly, the most disadvantageous force state of the connection structure under static load and impact load was determined. Furthermore, the basic mechanical properties of the materials were tested. The orthotropic constitutive model was defined based on the experimental results. Then, the optimal construction parameters of connection structure were analyzed. Finally, the tensile strength test of the connection structure was carried out to verify the accuracy of numerical calculation and to determine the failure mode and load. Research results show that mechanical properties of FRP materials are orthotropic. The transverse average tensile strength is 332 MPa, tensile modulus is 2.99 GPa and the longitudinal average tensile strength is 350 MPa, tensile modulus is 3.32 GPa. The most disadvantageous state of the connection structure is tension under the static and impact loads for tension, compression and shear. The deformation characteristic is that the angular of slot root increases and the pin has a tendency to be pulled out. Connection performance is the best when the ratio of the root width of slot tooth plate to the width of pin tooth plate is 0.8 and the internal rotation angle of slot tooth plate is 6 ° to 8 °. The tensile capacity of single pin connection under optimal construction is 1 290 kN and the maximum stress is 341 MPa. The tensile stiffness of scale test model is 428.5 kN/m. The calculation value of tensile failure load of scale test model is 22.5 kN and the measured value is 22 kN. The failure mode is that the root of the slot is torn and the pin is pulled out.

Key words: bridge engineering, FRP, anti-collision device, connection structure, structural test, numerical simulation